用库函数写一个关于stm32f4的一个10ms的计时器

Sure, I can help you write a 10ms timer for stm32f4 using library functions. Here is an example code snippet in C:

#include "stm32f4xx.h"
#include "stm32f4xx_hal.h"

void TIM_Config(void);
void delay_ms(uint32_t ms);

int main(void) {
  HAL_Init();
  TIM_Config();
  
  while(1) {
    delay_ms(100); // wait for 100 ms
  }
}

void TIM_Config(void) {
  TIM_HandleTypeDef htim;
  TIM_OC_InitTypeDef sConfigOC;
  
  // enable clock for TIM2
  __HAL_RCC_TIM2_CLK_ENABLE();
  
  // set the timer base configuration
  htim.Instance = TIM2;
  htim.Init.Prescaler = (uint32_t)(SystemCoreClock / 10000) - 1;
  htim.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim.Init.Period = 10 - 1; // 10ms timer
  
  // initialize TIM2
  HAL_TIM_Base_Init(&htim);
  
  // configure the timer channel as output compare
  sConfigOC.OCMode = TIM_OCMODE_ACTIVE;
  sConfigOC.Pulse = 0;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  HAL_TIM_OC_ConfigChannel(&htim, &sConfigOC, TIM_CHANNEL_1);

  // start the timer
  HAL_TIM_Base_Start(&htim);
  HAL_TIM_OC_Start(&htim, TIM_CHANNEL_1);
}

void delay_ms(uint32_t ms) {
  // wait for ms milliseconds
  uint32_t start = HAL_GetTick();
  while(HAL_GetTick() - start < ms);
}

This code configures the STM32F4 Timer 2 to fire every 10ms using the HAL library functions. The `delay_ms()` function uses the HAL `HAL_GetTick()` function to wait for a specified number of milliseconds. Note that this code assumes that you have already set up your IO pins for timer output as appropriate. Let me know if you have any further questions!